namespace BookUtil
{
    class Book
    {
        private long id;
        private string name;
        private string isbn;
        private double price;

        public Book()
        {
            this.id = 1L;
            this.name = "UNNAMED BOOK";
            this.isbn = "UNKNOWN ISBN";
            this.price = 0D;
        }

        public Book(long id, string name, string isbn, double price)
        {
            this.id = id;
            this.name = name;
            this.isbn = isbn;
            this.price = price;
        }

        override public string ToString()
        {
            return "Book: " + id + name + isbn + price;
        }
    }
}